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https://issues.apache.org/jira/browse/PROTON-2365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314104#comment-17314104
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Fabrice Fontaine commented on PROTON-2365:
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Patches have been merged in buildroot:
[https://git.buildroot.net/buildroot/commit/?id=2c2c0192a2463b8e8d0f7937b89fa83b16d93cab]
[https://git.buildroot.net/buildroot/commit/?id=64f34fbcfeb373b839d43bb986812714540cec07]
So, I'll close this ticket, thanks for helping fixing this issue on buildroot
side.
> Build failure without C++
> -------------------------
>
> Key: PROTON-2365
> URL: https://issues.apache.org/jira/browse/PROTON-2365
> Project: Qpid Proton
> Issue Type: Bug
> Components: build
> Affects Versions: proton-c-0.33.0
> Reporter: Fabrice Fontaine
> Priority: Major
> Attachments: 0003-CMakeLists.txt-fix-build-without-C.patch
>
>
> For an unknown reason, the following build failure is raised when the
> toolchain does not have a working C++ compiler (with cmake 3.18.4):
> {code:java}
> -- The CXX compiler identification is unknown
> CMake Error at CMakeLists.txt:73 (enable_language):
> The CMAKE_CXX_COMPILER:
> /home/giuliobenetti/autobuild/run/instance-3/output-1/host/bin/arm-linux-g++
> is not a full path to an existing compiler tool.
> Tell CMake where to find the compiler by setting either the environment
> variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
> to the compiler, or to the compiler name if it is in the PATH.
> -- Configuring incomplete, errors occurred!
> {code}
> I don't understand why this build failure is raised because
> enable_language(CXX) is correctly protected by
> {code:java}
> check_language (CXX)
> if (CMAKE_CXX_COMPILER){code}
> Perhaps, there is a bug inside cmake, to fix it, check for BUILD_CPP
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